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+.. Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+..
+.. SPDX-License-Identifier: MPL-2.0
+..
+.. This Source Code Form is subject to the terms of the Mozilla Public
+.. License, v. 2.0.  If a copy of the MPL was not distributed with this
+.. file, you can obtain one at https://mozilla.org/MPL/2.0/.
+..
+.. See the COPYRIGHT file distributed with this work for additional
+.. information regarding copyright ownership.
+
+Notes for BIND 9.16.25
+----------------------
+
+Feature Changes
+~~~~~~~~~~~~~~~
+
+- Overall memory use by ``named`` has been optimized and reduced,
+  especially on systems with many CPU cores. The default memory
+  allocator has been switched from ``internal`` to ``external``. A new
+  command-line option ``-M internal`` allows ``named`` to be started
+  with the old internal memory allocator. :gl:`#2398`
+
+Bug Fixes
+~~~~~~~~~
+
+- On FreeBSD, TCP connections leaked a small amount of heap memory,
+  leading to an eventual out-of-memory problem. This has been fixed.
+  :gl:`#3051`
+
+- If signatures created by the ZSK were expired and the ZSK private key
+  was offline, the signatures were not replaced. This behavior has been
+  amended to replace the expired signatures with new signatures created
+  using the KSK. :gl:`#3049`
+
+- Under certain circumstances, the signed version of an inline-signed
+  zone could be dumped to disk without the serial number of the unsigned
+  version of the zone. This prevented resynchronization of the zone
+  contents after ``named`` restarted, if the unsigned zone file was
+  modified while ``named`` was not running. This has been fixed.
+  :gl:`#3071`
+
+Known Issues
+~~~~~~~~~~~~
+
+- There are no new known issues with this release. See :ref:`above
+  <relnotes_known_issues>` for a list of all known issues affecting this
+  BIND 9 branch.